/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jasper.compiler;

import org.apache.jasper.runtime.ExceptionUtils;

import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * Class responsible for converting error codes to corresponding localized
 * error messages.
 *
 * @author Jan Luehe
 */
public class Localizer {

	private static ResourceBundle bundle = null;

	static {
		try {
			bundle = ResourceBundle.getBundle(
					"org.apache.jasper.resources.LocalStrings");
		} catch (Throwable t) {
			ExceptionUtils.handleThrowable(t);
			t.printStackTrace();
		}
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode) {
		String errMsg = errCode;
		try {
			errMsg = bundle.getString(errCode);
		} catch (MissingResourceException e) {
		}
		return errMsg;
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 * @param arg Argument for parametric replacement
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode, String arg) {
		return getMessage(errCode, new Object[]{arg});
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 * @param arg1 First argument for parametric replacement
	 * @param arg2 Second argument for parametric replacement
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode, String arg1, String arg2) {
		return getMessage(errCode, new Object[]{arg1, arg2});
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 * @param arg1 First argument for parametric replacement
	 * @param arg2 Second argument for parametric replacement
	 * @param arg3 Third argument for parametric replacement
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode, String arg1, String arg2,
	                                String arg3) {
		return getMessage(errCode, new Object[]{arg1, arg2, arg3});
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 * @param arg1 First argument for parametric replacement
	 * @param arg2 Second argument for parametric replacement
	 * @param arg3 Third argument for parametric replacement
	 * @param arg4 Fourth argument for parametric replacement
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode, String arg1, String arg2,
	                                String arg3, String arg4) {
		return getMessage(errCode, new Object[]{arg1, arg2, arg3, arg4});
	}

	/*
	 * Returns the localized error message corresponding to the given error
	 * code.
	 *
	 * If the given error code is not defined in the resource bundle for
	 * localized error messages, it is used as the error message.
	 *
	 * @param errCode Error code to localize
	 * @param args Arguments for parametric replacement
	 *
	 * @return Localized error message
	 */
	public static String getMessage(String errCode, Object[] args) {
		String errMsg = errCode;
		try {
			errMsg = bundle.getString(errCode);
			if (args != null) {
				MessageFormat formatter = new MessageFormat(errMsg);
				errMsg = formatter.format(args);
			}
		} catch (MissingResourceException e) {
		}

		return errMsg;
	}
}
